I have run both the sdkmanager command line, and the SDK Manager throuhg Visual Studio to add 28 but still it will not show in my properties in Visual Studio.
If I manually change it in the .csproj, I get:
Project [PROJECT] cannot build using TargetFrameworkVersion v9.0 because it s not supported. Please change your Xamarin.Android project to target an API version that is supported.
What am I missing? How can I get Visual Studio/Xamarin to recognize that it is installed?
